Method and device for controlling and monitoring gas flow rate

Abstract

The invention relates to the technical field of medical respiratory gas monitoring, in particular to a method and a device for controlling and monitoring the gas flow rate. The technical scheme is that whether a gas path is blocked is judged according to control parameters of the flow rate while the gas flow rate is detected and controlled. Therefore, the gas sampling flow rate of a medical device can be effectively monitored and controlled. A sampling device is timely processed under the condition of the overhigh flow rate, damage to patients caused by high-speed sampling is avoided, and users can be reminded timely under the condition that the sampling gas path is blocked, so that safety and reliability of a system are improved.

Description

technical field [0001] The invention relates to the technical field of medical breathing gas monitoring, in particular to a method and device for controlling and monitoring gas flow rate. Background technique [0002] In the field of medical respiratory monitoring, it is necessary to measure the exhaled and inhaled gases of patients, such as carbon dioxide, oxygen, nitrous oxide and various anesthetics. At present, there are two main types of respiratory gas monitoring instruments: mainstream and side flow. A small part of the gas sample is collected in the respiratory airway and sent to the instrument next to the patient for analysis. It can be used for intubated and non-intubated patients. Side-flow instruments are more widely used than mainstream instruments and are more common in clinical practice. [0003] The gas sampling flow rate of the side-flow instrument is usually 50~250ml / min. For patients with relatively small tidal volumes such as infants, if the sampling gas...

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Problems solved by technology

[0003] The gas sampling flow rate of the side-flow instrument is usually 50~250ml / min. For patients with relatively small tidal volume such as infants, if the sampling gas flow rate is too high The sampled gas will be polluted, which will affect the accuracy of the measurement. In severe cases, it may cause abnormal airway pressure and gas supply, which will affect the patient's breathing and endanger the patient's life.

[0004] Another problem that needs to be solved in the side-flow instrument gas sampling system is: the moisture and secretions exhaled by the patient will continue to accumulate in the gas collection path, and the accumulated Most of the sampling gas path will be blocked, which will affect the normal measurement. It is necessary to remind the user to check or replace the relevant parts of the sampling gas path

[0005]In the current prior art, there is no technical solution for the equipment to automatically solve the above two problems at the same time, and the operator is generally responsible for the blockage of the air circuit. Operate and replace after artificial judgment through experience, so there are deficiencies in the prior art

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